page.h
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上传日期:2013-02-24
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文件大小:2k
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1994 - 1999, 2000 by Ralf Baechle
- * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
- */
- #ifndef _ASM_PAGE_H
- #define _ASM_PAGE_H
- #include <linux/config.h>
- /* PAGE_SHIFT determines the page size */
- #define PAGE_SHIFT 12
- #define PAGE_SIZE (1UL << PAGE_SHIFT)
- #define PAGE_MASK (~(PAGE_SIZE-1))
- #ifdef __KERNEL__
- #ifndef _LANGUAGE_ASSEMBLY
- #define BUG() do { printk("kernel BUG at %s:%d!n", __FILE__, __LINE__); *(int *)0=0; } while (0)
- #define PAGE_BUG(page) do { BUG(); } while (0)
- extern void (*_clear_page)(void * page);
- extern void (*_copy_page)(void * to, void * from);
- #define clear_page(page) _clear_page(page)
- #define copy_page(to, from) _copy_page(to, from)
- #define clear_user_page(page, vaddr) clear_page(page)
- #define copy_user_page(to, from, vaddr) copy_page(to, from)
- /*
- * These are used to make use of C type-checking..
- */
- typedef struct { unsigned long pte; } pte_t;
- typedef struct { unsigned long pmd; } pmd_t;
- typedef struct { unsigned long pgd; } pgd_t;
- typedef struct { unsigned long pgprot; } pgprot_t;
- #define pte_val(x) ((x).pte)
- #define pmd_val(x) ((x).pmd)
- #define pgd_val(x) ((x).pgd)
- #define pgprot_val(x) ((x).pgprot)
- #define __pte(x) ((pte_t) { (x) } )
- #define __pme(x) ((pme_t) { (x) } )
- #define __pgd(x) ((pgd_t) { (x) } )
- #define __pgprot(x) ((pgprot_t) { (x) } )
- #endif /* _LANGUAGE_ASSEMBLY */
- /* to align the pointer to the (next) page boundary */
- #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
- /*
- * This handles the memory map.
- * We handle pages at KSEG0 for kernels with upto 512mb of memory,
- * at XKPHYS for kernels with more than that.
- */
- #ifdef CONFIG_SGI_IP22
- #define PAGE_OFFSET 0xffffffff80000000UL
- #endif
- #ifdef CONFIG_SGI_IP27
- #define PAGE_OFFSET 0xa800000000000000UL
- #endif
- #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
- #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
- #ifndef CONFIG_DISCONTIGMEM
- #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- #endif
- #endif /* defined (__KERNEL__) */
- #endif /* _ASM_PAGE_H */